If it is a closed curve, we should be able to replace it by a double integral.
如果是一条闭曲线，也可以用二重积分来代替的。
If we edit search.gsp and replace the current input fields with the following fields, it should give us what we're looking for.
如果我们编辑search .gsp，并使用以下域替换当前的输入域，我们将会获得所期望的东西。
We should open and check the shaft seal. If it leaks, then replace it, if necessary.
应该拆检轴封。如果发生漏泄，有必要就换掉它。
And besides, we should not replace a filament bulb with a low-energy one and be done with it.
再者，我们不能认为就是把节能灯换上就万事大吉了。
And besides, we should not replace a filament bulb with a low-energy one and be done with it.
再者，我们不能认为就是把节能灯换上就万事大吉了。
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